Abstract
A charge-coupled device (CCD) has been integrated with a surface-acoustic-wave (SAW) piezoelectric delay line in a hybrid gap-coupled structure to produce an electronically programmable analog matched filter in which the filter function is controlled by the charge pattern clocked into the CCD. This device allows analog-analog correlation of SAW input signals of ≲40-MHz bandwidth and ≲3.5-μs duration. Programming time is 6 ms at a 100-kHz clock rate, and the reference holding time is 1 s for a 3-dB degradation of the correlation peak. Operation as a matched filter for a 3.25-μs-long 13-bit Barker-encoded signal yields a peak correlation level of −41 dB m.
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